A rod assembly for the extraction of magnetizable particles from solutions is described. The rod assembly includes at least one guide element. A rod element is insertable into the at least one guide element and moveable in a direction substantially parallel to the at least one guide element. A magnet element is moveable to a distal magnet element position; wherein the distal magnet element position is located on a distal end section of the at least one guide element; wherein the at least one guide element includes an opening at a distal end. A method for the extraction of magnetizable particles from solutions is also described, as well as a magnet element for the extraction of magnetizable particles from solutions.